Improvement in governors for steam-engines



Fries.

JAMES B. DUFF, OF PATGHOGUE, NEW YORK.

IMPROVEMENT IN GOVERNORS FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 126,039, dated April 23, 1872.

To all whom it may concern: j

Be it known that I, JAMES B. DUFF, of Patchogue, in the county of Suolk and State of New York, have invented a new and lmproved Governor; and I do hereby declare the following to be a full, clear, and, exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which drawing- Figurel represents a vertical central section of my governor. Fig.V 2 is a horizontal section of the same in the plane w w, Fig. 1. Fig. 3 is a similar section in the plane y y, Fig. l. Fig. 4 is a detached sectional plan view of the lever which forms the connection between the governor and the throttle-valve.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of a centrifugal or rotary pump receiving motion from a steamengine, and working in a barrel or cylinder containing a piston which connects with the throttle-valve of the steamengine in such a manner that whenever the speed of the engine increases beyond the desired point the pressure of the iiuid brought to bear on the governor-piston by the action of the rotary pump closes the throttle-valve, and when the speed of the engine decreases the throttle-valve opens, and by these means a simple, effective, and sensitive governor is obtained, which can be used with equal advantage for stationary or for marine engines. With the rotary pump and governor-piston is combined a concave, which is rmly secured in the governor-cylinder, and serves to concentrate the fluid in the annular space between its edge and said cylinder by the action of the pump, thereby producing an increased pressure ofthe uid ou the governor-piston.

In the drawing, the letter A designates a reservoir, which is filled with water or other iiuid, and in which is secured a case, B, the lower part of which is constructed in the form of an inverted truncated cone, inclosing the piston-wheel C of a rotary pump, while the upper part of said case is cylindrical, and contains a piston or plunger, D. The piston-wheel C is mounted on avertical shaft, E,which connects, by bevel-gear a b and a horizontal shaft, F, with a steam-engine, the speed of the engine being geared up so as to impart to the piston-wheel of the pump a very rapid revolving motion. Said piston-wheel is made in the form of a double cone, (see Fig. 1,) and it contains four, more or less, projecting flanges c, which maybe parallel with the shaft E, or which may be made to run in an oblique direction. In the cylindrical part of the case B, close over the junction thereof with its conical part, is firmly secured a concave, G, which forms the bearing for the upper end of the shaft E, and the diameter of which is somewhat less than that of the cylinder B, leaving an annular space7 d, which forms the channel of communication between the rotary pump and the governor-cylinder.

The piston Dis packed in the most approved manner, so that the same works in its cylinder with the least possible friction, and with as little leakage as practicable; but the iiuid which may leak past the piston is allowed to flow back into the reservoir A through holes e in the upper part ofthe governor-cylinder.

The rod Hof the piston D connects with a lever, I, that carries a weight, J, and is intended to connect with the throttle-valve of the engine.

The connection between the piston-rod H and 4the lever I is, by preference, eiected by means of a cap or thimble, f, hung between screws g,(see Fig. 4,) said cap being made to rest loosely on the pointed or rounded end of the piston-rod. The object of this connection is to allow the lever I to swing up and down without causing the piston-rod to bind.

The weight J is adjustable on the lever I, and it serves to open the throttle-valve whenever the speed of the engine decreases; and since the power exerted by the governor-piston is always greater than would be necessary to close the throttle-valve, the weight can be readily so adjusted on the lever that it will open the throttle-valve immediately the governor-piston sinks down. Ii' desired, however, the connection between the governor-piston and the throttle-valve may be so arranged that said piston imparts to the throttle-valve a positive motion in either direction.

' The action of my governor requires but little explanation. As soon as the engine is started the iluid contained in the reservoirAis driven upward into the governor-cylinder B, and

if the pressure of the duid thus driven upward exceeds a certain limit the governor-piston is driven upward and the throttle-valve closes, and as soon as the speed of the rotary pump decreases thev governor-piston sinks down, driving the fluid back into the reservoir A.

The action of the uid driven upward by the rotary pump is insured by the concave G and the double angie of the piston-wheel, the lower part of which drives the duid upward, while the upper part combined with the concave drives the iuidV down, thereby concentrating the same in the annular space d and throwing it with increased force against the governorpiston.

What I claim as new, and desire to secure by Letters Patent, is

of February, 1872.

J. B. DUFF.

Witnesses W.- HAUFF, E. F. KASTENHUBER. 

